package cn.tekin.utils.security;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5 {
    public static void main(String[] args) {

        System.out.println(getDigest("123"));
    }
    /*
     * MD5加密
     */
    public static String getDigest(String str) {
        MessageDigest messageDigest = null;

        try {
            messageDigest = MessageDigest.getInstance("MD5");
            messageDigest.reset();
            messageDigest.update(str.getBytes("UTF-8"));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        byte[] byteArray = messageDigest.digest();
        StringBuffer md5StrBuff = new StringBuffer();

        for (int i = 0; i < byteArray.length; i++) {
            if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) {
                md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
            } else {
                md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
            }
        }

        return md5StrBuff.toString().toUpperCase();
    }
}